Phlegm in the throat can be divided into two types, one that is more phlegm accompanied by cough, fever and other symptoms, is caused by upper respiratory tract infection; the latter is less phlegm, generally only conscious phlegm in the throat, most of them are not accompanied by cough and other performance, may be pharyngeal heterosensitivity, can be caused by organic diseases such as pharyngeal inflammation, tumors, structural abnormalities, keratosis, or by non-organic diseases such as menopause and other endocrine imbalance performance, as well as psycho-psychological factors.